我想使用正则表达式替换文本

Question

In my code i am trying to replace <Run Foreground="#FFFF0000"> with <Run Foreground="#FFFF0000" Text="

right now i am using this

Regex.Replace(XMLString, @"<Run.*?>", "<Run Text=\"", RegexOptions.IgnoreCase); 

which replaces <Run Foreground="#FFFF0000"> with <Run Text="

I just want to replace > with text = " whenever i encounter <Run .

How can i archive this ?

Answer 1

An alternative to capturing would be to use a lookbehind:

Regex.Replace(XMLString, @"(?<=<Run[^<]*)>", " Text=\"", RegexOptions.IgnoreCase);

This will now only match > that are preceded by <Run after an arbitrary number of non- < character (so within the same tag).

Answer 2

If this is an XML document, then you can just use XPath to select the Run elements and add attributes to the selected elements. It's a better option than using Regex.

Try something like this:

string txtAttributeName = "Text";
foreach(XmlNode element in xmlDocument.SelectNodes(".//Run")
{
    if (element.Attributes.GetNamedItem(txtAttributeName) == null)
    {
        XmlAttribute txtAttribute = xmlDocument.CreateAttribute(txtAttributeName);
        txtAttribute.Value = "Whatever you want to place here";

        element.Attributes.Append(txtAttribute);
    }
}

Note: I haven't tested this, but it should give you a good idea.

Answer 3

Option 1)

Regex.Replace(XMLString, @"(<Run.*?)>", "$1 Text=\"", RegexOptions.IgnoreCase);

Option 2)

Regex.Replace(XMLString, @"(?<=<Run.*?)>", " Text=\"", RegexOptions.IgnoreCase);

Answer 4

You need to capture the text you want to keep, then re-add it. I haven't test this, but:

Regex.Replace(XMLString, @"<Run(.*?)>", "<Run$1 Text=\"", RegexOptions.IgnoreCase);